CN114076110A

CN114076110A - A coaxial fan with axial inlet and outlet air

Info

Publication number: CN114076110A
Application number: CN202010805690.3A
Authority: CN
Inventors: 高向武; 邓方焱; 陶家庭; 焦烨鋆
Original assignee: Beijing Longchuang Blue Sky S&t Co ltd
Current assignee: Beijing Longchuang Blue Sky S&t Co ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2022-02-22

Abstract

The invention discloses a coaxial fan with axial air inlet and outlet, which comprises a coaxial centrifugal wind wheel, a driving device, a lower cover body and an air outlet cover body, wherein the centrifugal wind wheel is rotatably arranged in the lower cover body, a driving shaft and a fixing part of the driving device are respectively detachably fixed on the centrifugal wind wheel and the lower cover body, a centrifugal cavity is reserved between the outer side part of the centrifugal wind wheel and the inner wall of the lower cover body, the top of the lower cover body is detachably fixed with the bottom of the air outlet cover body, the inner wall of the air outlet cover body is annularly provided with an air outlet cavity communicated with the centrifugal cavity, the air outlet cover body is provided with an air outlet, at least two guide plates are annularly arranged in the air outlet cover body, the guide plates are inclined from the center to the outside along the radial direction from bottom to top, a flow guide cavity with a closing-in is surrounded between the adjacent guide plates, the flow guide cavity is arranged in the air outlet cavity, and the flow guide cavity is communicated with the air outlet. The coaxial fan capable of axially feeding and discharging air has the advantages of simple structure, small volume, capability of axially feeding air and axially discharging air, high operation efficiency and capability of effectively reducing noise.

Description

Coaxial fan capable of axially feeding and discharging air

Technical Field

The invention relates to a purification unit, in particular to a coaxial fan for axial air inlet and outlet of suction gas.

Background

Along with the increasing development of national economy, people have better and better physical life, and the requirement of people on the air quality in the living environment is higher and higher. The demands on the working environment in industry are also increasing. It is common in residential and industrial environments to install range hoods or air purifiers. The existing range hood and air purifier generally adopt axial air inlet and radial air outlet fans, and such fans have the defects of large volume, difficult installation and use and large occupied space. And the air-out needs the direction of bending moreover, therefore the fan efficiency is whole not high, and the noise ratio is great moreover.

Disclosure of Invention

The invention is completed for solving the defects in the prior art, and aims to provide a coaxial fan which has a simple structure, greatly reduced volume, axial air inlet and axial air outlet, high air suction operation efficiency and can effectively reduce noise and axially feed and discharge air.

The invention relates to a coaxial fan capable of axially feeding and discharging air, which comprises a centrifugal wind wheel, a driving device, a lower cover body and an air outlet cover body, wherein the centrifugal fan, the lower cover body and the air outlet cover body are coaxially arranged, the centrifugal wind wheel is rotatably arranged in the lower cover body, a driving shaft of the driving device is detachably fixed with the centrifugal wind wheel, a fixing part of the driving device is detachably fixed on the air outlet cover body, a centrifugal cavity is reserved between the outer side part of the centrifugal wind wheel and the inner wall of the lower cover body, the top of the lower cover body is detachably fixed with the bottom of the air outlet cover body, an air outlet cavity is annularly arranged on the inner wall of the air outlet cover body, the centrifugal cavity is communicated with the air outlet cavity, an air outlet is arranged at the top of the air outlet cover body, at least two guide plates are annularly arranged in the air outlet cover body from the center of the air outlet cover body to the inner wall of the air outlet cover body, and the guide plates are inclined from bottom to top along the radial direction And a flow guide cavity extending upwards and closing up is arranged between the adjacent flow guide plates, the flow guide cavity is arranged in the air outlet cavity, and the flow guide cavity is communicated with the air outlet.

The coaxial fan for axially inlet and outlet air can also be as follows:

the guide plate extends upwards to the top air outlet of the air outlet cover body from the bottom of the air outlet cover body.

Each guide plate surrounds the air outlet cover body, and the guide plates are spirally arranged in the air outlet cover body in an ascending mode.

The air outlet cover body is characterized in that a driving avoiding cover is arranged in the center of the bottom of the air outlet cover body, the upper portion of the driving device is located in the driving avoiding cover, the inner side of the guide plate is fixed to the outer wall of the driving avoiding cover, the outer side of the guide plate is fixed to the inner wall of the air outlet cover body, the top of the driving avoiding cover is communicated with the air outlet, and the fixing portion of the driving device can be detachably fixed to the bottom of the driving avoiding cover.

The lower cover body is including the lower barrel that is located the edge fixing dish at top and is located the lower part, edge fixing dish bottom with barrel top is fixed or integrated into one piece down, the air-out cover body bottom with fixed connection can be dismantled to the edge fixing dish.

The centrifugal wind wheel is characterized in that a downward bulge is arranged in the center of the centrifugal wind wheel, a shaft sleeve protruding downwards is arranged on the lower bulge, a driving shaft of the driving device penetrates through the shaft sleeve, and the shaft sleeve is detachably and fixedly connected with the driving shaft of the driving device.

And a limiting rod is arranged on the upper part of a driving shaft of the driving device and can be abutted with the upper surface of the lower bulge in a contact manner.

At least one spiral type ascending flow deflector is arranged on the inner wall of the lower cover body from bottom to top, and a gap is reserved between the innermost side of the flow deflector and the outermost side of the centrifugal wind wheel

The bottom of the lower cover body is detachably fixed with an air inlet check ring, the centrifugal wind wheel is rotatably arranged in the cavity between the air inlet check ring and the top of the lower cover body, the center of the air inlet check ring is provided with an air inlet, and the outside and the centrifugal cavity are communicated through the air inlet.

The air purification device is characterized in that an air purification unit is detachably fixed to the lowest end of a driving shaft of the driving device, the air purification unit is located under the centrifugal wind wheel, and the center of the air purification unit is detachably fixed with the center of the centrifugal wind wheel.

The invention relates to a coaxial fan capable of axially feeding and discharging air, which comprises a centrifugal wind wheel, a driving device, a lower cover body and an air outlet cover body, wherein the centrifugal fan, the lower cover body and the air outlet cover body are coaxially arranged, the centrifugal wind wheel is rotatably arranged in the lower cover body, a driving shaft of the driving device is detachably fixed with the centrifugal wind wheel, a fixing part of the driving device is detachably fixed on the air outlet cover body, a centrifugal cavity is reserved between the outer side part of the centrifugal wind wheel and the inner wall of the lower cover body, the top of the lower cover body is detachably fixed with the bottom of the air outlet cover body, an air outlet cavity is annularly arranged on the inner wall of the air outlet cover body, the centrifugal cavity is communicated with the air outlet cavity, an air outlet is arranged at the top of the air outlet cover body, at least two guide plates are annularly arranged in the air outlet cover body from the center of the air outlet cover body to the inner wall of the air outlet cover body, and the guide plates are inclined from bottom to top along the radial direction And a flow guide cavity extending upwards and closing up is arranged between the adjacent flow guide plates, the flow guide cavity is arranged in the air outlet cavity, and the flow guide cavity is communicated with the air outlet. Like this, drive arrangement's drive shaft drives centrifugal wind wheel is rotatory, centrifugal wind wheel is rotatory at the inside negative pressure that forms of centrifugal wind wheel, and then the suction air in the centrifugal wind wheel passes the clearance in centrifugal wind wheel outside gets into centrifugal cavity, then the air that is purified reentries under the pushing and pressing effect of back air with centrifugal wind wheel intercommunication in the air-out cavity, get into out the fan housing promptly internally, then go out the internal gas of fan housing and follow the guide plate under the dual function of the pushing and pressing of the air that constantly purified in its below and the guide plate upwards to the binding off gradually the water conservancy diversion cavity removes to finally be discharged from the air outlet. And the air source is continuously discharged out of the diversion cavity, the air in the air outlet cover is continuously discharged outwards, negative pressure is continuously formed in the center of the centrifugal wind wheel, and finally the air is further sucked from the lower part under the rotating action of the rotating centrifugal wind wheel and finally discharged out of the air outlet according to the above circulation steps. The centrifugal wind wheel continuously rotates to continuously suck gas inwards, so that the gas axially enters the fan from the lower part of the centrifugal wind wheel and is finally axially discharged from the air outlet positioned above the fan, namely, axial air inlet and axial air outlet are realized, meanwhile, because the centrifugal cavity between the centrifugal wind wheel and the lower cover body does not need too large size, unlike the axial air inlet used in the prior art, the side edge of the fan with radial air outlet needs a larger air duct to collect the entering gas, the sucked gas enters the centrifugal cavity, moves upwards and is directly pushed into the air outlet cavity and separately enters each flow guide cavity under the action of the flow guide plate, and because the flow guide cavities extend upwards and close up, the gas quickly rises after being guided and is discharged out of the air outlet. Like this holistic lower cover body size with the size of the air-out cover body all need only compare centrifugal wind wheel's size slightly bigger can, and need not set up the spiral case again, consequently the size of the coaxial fan of whole axial business turn over wind is very little, the volume reduces greatly under the condition of unit area suction rate, occupation space also reduces by a wide margin, production and installation cost also reduce by a wide margin, and because gaseous direct is axial air inlet and axial air-out, therefore gaseous mutual interference influence is less, compare the fan of current axial air inlet and axial air-out and the fan of current use spiral case, the noise reduces by a wide margin. Compared with the prior art, the coaxial fan with the axial air inlet and outlet has the advantages that: simple structure, volume reduce greatly, can axial air inlet axial air-out, suction wind operation efficiency is high, can effectively the noise reduction moreover.

Drawings

Fig. 1 is an exploded view of an embodiment of a coaxial fan for axially feeding and discharging air.

FIG. 2 is a half-sectional view of an embodiment of a coaxial fan for axially feeding and discharging air.

FIG. 3 is a half-sectional view of another embodiment of the coaxial fan with axial air inlet and outlet.

Fig. 4 is an exploded view of another embodiment of the coaxial fan with axial air inlet and outlet.

Fig. 5A, 5B and 5C are respectively a schematic view, a bottom view and a half-section view of a centrifugal wind wheel of a coaxial fan with axial wind inlet and outlet.

Fig. 6A, 6B, 6C and 6D are a front schematic view, a rear schematic view, a bottom view and a half-section view of the lower cover body of the coaxial fan with axial air inlet and outlet respectively.

Fig. 7A, 7B and 7C are respectively a schematic diagram, a bottom view and a half-section of an air outlet cover body of a coaxial fan for axially inlet and outlet air.

Description of the figures

1 … centrifugal wind wheel 2 … driving device 3 … lower cover

4 … air outlet hood body 5 … drive shaft 6 … air outlet

7 … baffle 8 … drives the bottom fixed disk of the dodge cover 9 …

10 … edge fixing disc 11 … lower cylinder 12 … fixing projection

13 … fixed hole 14 … shaft sleeve 15 … limiting rod

16 … air inlet check ring 17 … air purification unit 18 … air inlet

19 ┄ flow deflector

Detailed Description

An axial wind inlet and outlet coaxial fan according to the present invention will be described in further detail with reference to fig. 1 to 7C of the drawings.

The invention relates to a coaxial fan for axially feeding and discharging air, please refer to fig. 1 to 7C, comprising a centrifugal wind wheel 1, a driving device 2, a lower cover body 3 and an air outlet cover body 4, wherein the centrifugal fan, the lower cover body 3 and the air outlet cover body 4 are coaxially arranged, the centrifugal wind wheel 1 is rotatably arranged in the lower cover body 3, a driving shaft 5 of the driving device 2 is detachably fixed with the centrifugal wind wheel 1, a fixed part of the driving device 2 is detachably fixed on the air outlet cover body 4, a centrifugal cavity is left between the outer side part of the centrifugal wind wheel 1 and the inner wall of the lower cover body 3, the top of the lower cover body 3 is detachably fixed with the bottom of the air outlet cover body 4, the inner wall of the air outlet cover body 4 is annularly provided with an air outlet cavity which is communicated, the top of the air outlet cover body 4 is provided with an air outlet 6, the air outlet cover body 4 is internally annularly arranged, at least two guide plates 7 are arranged at the center of the air outlet cover body 4, the guide plates 7 are inclined from bottom to top along the radial direction from the center of the air outlet cover body 4 to the inner wall of the air outlet cover body 4, a flow guide cavity extending upwards and closing up is arranged between the adjacent guide plates 7, the flow guide cavities are arranged in the air outlet cavity, and the flow guide cavities are communicated with the air outlet 6. Like this, drive arrangement 2's drive shaft 5 drives centrifugal wind wheel 1 is rotatory, centrifugal wind wheel 1 is rotatory at the inside 1 negative pressure that forms of centrifugal wind wheel, and then the suction air in the centrifugal wind wheel 1 passes the clearance in centrifugal wind wheel 1 outside gets into centrifugal cavity, then the air that is purified reentries under the pushing and pressing effect of back air with centrifugal wind wheel 1 intercommunication in the air-out cavity, get into the air-out cover body 4 promptly, then the gas in the air-out cover body 4 under the below constantly bulldozes the air that is purified and the dual function of guide plate 7 down along guide plate 7 upwards gradually to the binding off the water conservancy diversion cavity removes to finally be discharged from air outlet 6. The air source is continuously discharged out of the flow guide cavity, the air in the air outlet cover body 4 is continuously discharged outwards, then negative pressure is continuously formed in the center 1 of the centrifugal wind wheel, finally the air is further sucked from the lower part under the rotating action of the rotating centrifugal wind wheel 1 and finally discharged out of the air outlet 6 according to the above circulation steps. The centrifugal wind wheel 1 continuously rotates to continuously suck gas outwards, so that the gas axially enters a fan from the lower part of the centrifugal wind wheel 1 and is finally axially discharged from an air outlet 6 positioned above the fan, namely, axial air inlet and axial air outlet are realized, meanwhile, because the centrifugal cavity between the centrifugal wind wheel 1 and a lower cover body 3 does not need too large size, unlike the axial air inlet used in the prior art, the side edge of the fan with radial air outlet needs a larger air duct to collect the entering gas, the sucked gas enters the centrifugal cavity, moves upwards to directly enter the air outlet cavity and separately enters each flow guide cavity under the action of a flow guide plate 7, and because the flow guide cavities extend upwards and close up, the gas is guided and quickly rises and is discharged out of the air outlet 6. Like this holistic lower cover body 3 size with the size of the air-out cover body 4 all need only compare centrifugal wind wheel 1's size slightly bigger can, and need not set up the spiral case again, consequently the size of the coaxial fan of whole axial business turn over wind is very little, the volume reduces greatly under the condition of unit area suction wind rate, occupation space also reduces by a wide margin, production and installation cost also reduce by a wide margin, and because gaseous direct is axial air inlet and axial air-out, therefore gaseous mutual interference influence is less, compare the fan of current axial air inlet and axial air-out and the fan of current use spiral case, the noise reduces by a wide margin. Compared with the prior art, the coaxial fan with the axial air inlet and outlet has the advantages that: simple structure, volume reduce greatly, can axial air inlet axial air-out, suction wind operation efficiency is high, can effectively the noise reduction moreover.

Referring to the relevant figures in fig. 1 to 7C, the coaxial fan with axial air inlet and outlet according to the present invention may further include: the guide plate 7 extends upwards from the bottom of the air outlet cover body 4 to the position of the top air outlet 6 of the air outlet cover body 4. Such guide plate 7 can guarantee to cut apart into two at least upwards extending and closing gradually the air-out cavity between 4 bottoms to the top of air-out cover body the water conservancy diversion cavity makes things convenient for gaseous reposition of redundant personnel discharge air outlet 6. The guide plate 7 is used for guiding and accelerating the speed of the discharged gas.

Referring to the relevant figures in fig. 1 to 7C, the coaxial fan with axial air inlet and outlet according to the present invention may further include: each guide plate 7 is spirally arranged in the air outlet cover body 4 in a rising manner around the center of the air outlet cover body 4. That is, the baffles 7 rise spirally in the air outlet cover 4, so that the mutual interference is small when the air is discharged, and the noise is low.

Referring to the relevant figures in fig. 1 to 7C, the coaxial fan with axial air inlet and outlet according to the present invention may further include: 4 bottom centers of the air-out cover body are provided with the drive and

dodge cover

8, 2 upper portions of drive arrangement are located the drive dodges in the cover 8, the inboard of guide plate 7 with the drive dodges that cover 8 outer wall is fixed, the outside of guide plate 7 with the inner wall of the air-out cover body 4 is fixed, the drive dodge cover 8 top with air outlet 6 intercommunication, drive arrangement's fixed part can be dismantled and be fixed in the drive dodges the bottom of cover. The driving avoiding cover 8 can effectively avoid the upper half part of the driving device 2, avoid the influence of gas on the operation of the driving device 2 and facilitate the installation of the guide plate 7. Meanwhile, the top of the driving avoiding cover 8 is communicated with the air outlet 6, so that the driving device 2 positioned in the driving avoiding cover can quickly dissipate heat, the driving device 2 is favorable for dissipating heat, and the phenomenon that the driving device 2 is overheated, so that the working efficiency is reduced or damaged is avoided. A further preferable technical solution in the technical aspect of the foregoing technical solution is: the bottom of the drive avoiding cover 8 is annularly provided with a bottom fixing disc 9, and the upper part of the drive device 2 is detachably fixed at the bottom of the drive avoiding cover 8. Therefore, the upper part of the driving device 2 (namely, the fixing part of the driving device 2) can be detachably fixed on the air outlet cover body 4, so that the fixing is firmer and the heat dissipation is convenient. The more preferable technical scheme is as follows: the outer periphery of the upper portion of the driving device 2 is annularly provided with fixing protrusions 12 extending outwards, the fixing protrusions 12 can be detachably fixed on the bottom fixing disc 9, and then the upper portion of the driving device 2 is fixed on the driving avoiding cover 8, namely the air outlet cover body 4. The more preferable technical scheme is as follows: the bottom fixing disc 9 and the fixing protrusions 12 are provided with fixing holes 13 corresponding to the positions, and the bottom fixing disc 9 and the fixing protrusions 12 are detachably connected together through detachable connection between bolts and nuts penetrating through the fixing holes 13. In this way, since the upper portion of the driving unit 2 is also detachably connected, it is possible to easily replace and maintain the driving unit 2 when it is damaged.

Referring to the relevant figures in fig. 1 to 7C, the coaxial fan with axial air inlet and outlet according to the present invention may further include: lower cover body 3 is including the lower barrel 11 that is located the edge fixed disk 10 at top and is located the lower part, edge fixed disk 10 bottom with barrel 11 top is fixed or integrated into one piece down, the air-out cover body 4 bottom with fixed connection can be dismantled to edge fixed disk 10. Like this, can with the air-out cover body 4 can be dismantled and fix on the cover body 3 down, can guarantee moreover the air-out cavity with communicate between the centrifugal cavity, and then guarantee that the operating efficiency who draws wind is than higher. The preferable technical scheme is that the diameter of the lower cylinder 11 is gradually reduced from bottom to top, and a frustum-shaped cylinder with a large lower part and a small upper part is formed, so that gas can be conveniently and quickly discharged, and the operation efficiency of the whole fan is effectively improved.

Referring to the relevant figures in fig. 1 to 7C, the coaxial fan with axial air inlet and outlet according to the present invention may further include: the centrifugal wind wheel is characterized in that a downward bulge is arranged in the center of the centrifugal wind wheel 1, a shaft sleeve 14 protruding downwards is arranged on the downward bulge, a driving shaft 5 of the driving device 2 penetrates through the shaft sleeve 14, and the shaft sleeve 14 is detachably and fixedly connected with the driving shaft 5 of the driving device 2. Like this, the middle part space of centrifugal wind wheel 1 is by make full use of, hides drive arrangement 2 partly centrifugal wind wheel 1 middle part effectively reduces the size of holistic fan, drive arrangement 2's drive shaft 5 simultaneously with centrifugal wind wheel 1's axle sleeve 14 can be dismantled fixedly, and then will drive arrangement 2's drive shaft 5 with centrifugal wind wheel 1 is fixed, drive arrangement 2's drive shaft 5 is rotatory to be driven wholly centrifugal wind wheel 1 rotates earlier, and then accomplishes the operation of induced drafting. On the basis of the above technical scheme, the further preferable technical scheme is as follows: and a limiting rod 15 is arranged at the upper part of the driving shaft 5 of the driving device 2, and the limiting rod 15 is in contact type abutting contact with the upper surface of the lower bulge. The limiting rod 15 is used for limiting the position of the driving shaft 5 of the driving device 2 and preventing the fixed part of the driving device 2 from contacting with the centrifugal wind wheel 1 to damage the centrifugal wind wheel 1 and the driving device 2.

Referring to the relevant figures in fig. 1 to 7C, the coaxial fan with axial air inlet and outlet according to the present invention may further include: the cross section size of the air outlet cover body 4 is gradually reduced from the bottom to the top. Like this can realize that guide plate 7 extends and closes up by supreme down, such structure is favorable to reducing moreover the whole weight of the air-out cover body 4 to form big-end-up's structure down, conveniently exhaust rapidly, improve the operating efficiency of whole fan.

Referring to the relevant figures in fig. 1 to 7C, the coaxial fan with axial air inlet and outlet according to the present invention may further include: at least one spiral type ascending flow deflector 19 is arranged on the inner wall of the lower cover body 3 from bottom to top, and a gap is reserved between the innermost side of the flow deflector 19 and the outermost side of the centrifugal wind wheel 1. Therefore, equivalently, a lower flow guide device is arranged in a gap between the outer side of the centrifugal wind wheel 1 and the lower barrel 11, gas centrifugally thrown out from the centrifugal wind wheel 1 is rapidly discharged upwards along the flow guide piece 19 from bottom to top under the action of the flow guide piece 19 rotating at a high speed and enters the air outlet cover body 4, so that the gas discharge efficiency is further improved, and the air continuously purified from the lower part can further discharge the gas in the air outlet cavity upwards as soon as possible.

Referring to the relevant figures in fig. 1 to 7C, the coaxial fan with axial air inlet and outlet according to the present invention may further include: an air inlet check ring 16 is detachably fixed at the bottom of the lower cover body 3, the centrifugal wind wheel 1 can be rotatably arranged in a cavity between the air inlet check ring 16 and the top of the lower cover body 3, an air inlet 18 is formed in the center of the air inlet check ring 16, and the outside and the centrifugal cavity are communicated through the air inlet 18. Like this, air inlet retaining ring 16 can with gap between centrifugal wind wheel 1 and the lower cover body 3 shelters from, guarantees that all wind is all followed the middle part of centrifugal wind wheel 1 gets into whole fan and follows centrifugal wind wheel 1's outside blade department is thrown into in the centrifugal cavity, avoid wind to follow centrifugal wind wheel 1 with installation gap department gets into between the lower cover body 3 centrifugal cavity further guarantees whole fan's operating efficiency. On the basis of the above technical solution, a further preferred technical solution is: the air inlet 18 corresponds to the air outlet 6. Namely, the air outlet 6 is positioned right above the air inlet 18, and the size of the air outlet 6 is smaller than that of the air inlet 18, so that the air axially enters and exits, the probability of radial deviation is low, the interference among the air can be further reduced, and the noise is further reduced.

Referring to the relevant figures in fig. 1 to 7C, the coaxial fan with axial air inlet and outlet according to the present invention may further include: an air purification unit is detachably fixed at the lowest end of a driving shaft 5 of the driving device 2, the air purification unit 17 is located under the centrifugal wind wheel 1, and the center of the air purification unit 17 is detachably fixed with the center of the centrifugal wind wheel 1. In this way, the air purification unit 17 is used for further purifying the air sucked into the centrifugal wind wheel 1, then sucking the air into the centrifugal wind wheel 1 and further entering the centrifugal cavity, and then discharging the air out of the air outlet 6 from the flow guiding cavity of the air outlet cavity. The whole fan has a purification function, the service life of the fan is further prolonged, the centrifugal wind wheel 1, the lower cover body 3, the air outlet cover body 4 and the guide plate 7 in the fan are prevented from being attached by liquid drops or solid particles in gas, and a covering surface is formed after a long time, so that the whole operation efficiency of the fan is reduced.

The above description is only for the purpose of illustrating a few embodiments of the present invention, and should not be taken as limiting the scope of the present invention, in which equivalent changes, modifications, or scaling up or down, etc. made in accordance with the spirit of the present invention should be considered as falling within the scope of the present invention.

Claims

1. A coaxial fan with axial inlet and outlet air, it is characterized in that: comprise centrifugal wind wheel, drive device, lower cover body and air outlet cover body, described centrifugal fan, described lower cover body and described air outlet cover The three bodies are coaxially arranged, the centrifugal wind wheel is rotatably arranged in the lower cover, the drive shaft of the driving device and the centrifugal wind wheel are detachably fixed, and the fixing part of the driving device is detachably fixed on the On the air outlet hood, a centrifugal cavity is left between the outer side of the centrifugal wind wheel and the inner wall of the lower hood, and the top of the lower hood and the bottom of the air outlet hood are detachably fixed. , the inner wall of the air outlet cover is provided with an air outlet cavity, the centrifugal cavity is communicated with the air outlet cavity, the top of the air outlet cover is provided with an air outlet, and the air outlet cover is surrounded by At least two deflectors are arranged in the center of the air outlet hood, and the deflectors are inclined from bottom to top in the radial direction from the center of the air outlet hood to the inner wall of the air outlet hood. A flow guide cavity extending upward and closed is surrounded between the guide plates, the flow guide cavity is arranged in the air outlet cavity, and the flow guide cavity is communicated with the air outlet.

2 . The coaxial fan with axial air inlet and outlet according to claim 1 , wherein the deflector extends upward from the bottom of the air outlet cover to the air outlet at the top of the air outlet cover. 3 . location.

3 . The coaxial fan with axial inlet and outlet air according to claim 1 , wherein each of the deflectors is arranged in the air outlet hood in a spiral ascending manner around the center of the air outlet hood. 4 .

4 . The coaxial fan with axial inlet and outlet air according to claim 1 , wherein a drive avoidance cover is arranged in the center of the bottom of the air outlet cover, and the upper part of the drive device is located in the drive avoidance cover. 5 . , the inner side of the deflector is fixed with the outer wall of the drive avoidance cover, the outer side of the deflector is fixed with the inner wall of the air outlet cover, the top of the drive avoidance cover is communicated with the air outlet, the The fixing part of the driving device is detachably fixed on the bottom of the driving avoidance cover.

5 . The coaxial fan with axial inlet and outlet air according to claim 1 , wherein the lower cover body comprises an edge fixing disc at the top and a lower cylinder at the lower part, and the bottom of the edge fixing disc is 5 . The top of the lower cylinder is fixed or integrally formed, and the bottom of the air outlet cover is detachably and fixedly connected to the edge fixing plate.

6. A coaxial fan with axial inlet and outlet air according to any one of claims 1 to 5, wherein the center of the centrifugal wind wheel is provided with a downward downward protrusion, and the lower The protrusion is provided with a downwardly protruding shaft sleeve, the driving shaft of the driving device passes through the shaft sleeve, and the shaft sleeve is detachably and fixedly connected with the driving shaft of the driving device.

7 . The coaxial fan with axial inlet and outlet air according to claim 6 , wherein a limit rod is arranged on the upper part of the drive shaft of the driving device, and the limit rod is connected to the upper part of the lower protrusion. 8 . The surfaces can be contacted against each other.

8 . The coaxial fan with axial inlet and outlet air according to any one of claims 1 to 5 , wherein at least one spirally rising guide is arranged on the inner wall of the lower cover from bottom to top. 9 . A flow sheet, there is a gap between the innermost side of the guide sheet and the outermost side of the centrifugal wind wheel.

9. A coaxial fan with axial inlet and outlet air according to any one of claims 1 to 5, characterized in that: a wind inlet baffle ring is detachably fixed at the bottom of the lower cover body, and the centrifugal wind wheel The air inlet is rotatably arranged in the cavity between the air inlet baffle ring and the top of the lower cover, and an air inlet is arranged in the center of the air inlet baffle ring, and the outside is communicated with the centrifugal cavity through the air inlet.

10. A coaxial fan with axial inlet and outlet air according to any one of claims 1 to 5, wherein an air purification unit is detachably fixed at the lowermost end of the driving shaft of the driving device, and the The air purification unit is located directly below the centrifugal fan wheel, and the center of the air purification unit and the center of the centrifugal fan wheel are detachably fixed.